<template>
	<view>
	<view class="search-box">
		<uni-search-bar @input="input" :radius="100" cancelButton="none" placeholder="请输入搜索内容" :focus="true" :showSync="true">
		</uni-search-bar>
	</view>
		<!-- 建议搜索列表 -->
		<view class="sugg-list" v-if="searchResults.length!==0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods-name">
					{{item.goods_name}}
				</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
		</view>
		</view>
		<!--  搜索历史-->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer:null,
				kw:'',
				searchResults:[],
				// 搜索关键词的历史记录
				historyList:[]
			};
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw')||'[]')
		},
		methods:{
			input(e){
			// 清除timer对应的延时器
			clearTimeout(this.timer)
			// 重新启动一个延时器，并把timerId赋值给this.timer
			this.timer = setTimeout(()=>{
				// 如果500毫秒内，没有触发新的输入事件，则为搜索关键字赋值
				this.kw = e
				this.getSearchList()
			},500)
			},
			// 根据搜索关键字，搜索商品建议列表
			async getSearchList(){
				// 判断搜索关键字是否为空
				if(this.kw.length===0){
					this.searchResults=[]
					return
				}
				const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
				if(res.meta.status!=200) return uni.$showMag()		
				this.searchResults = res.message
				// 查询到搜索建议后，调用saveSearchHistory()方法保存关键字
				this.saveSearchHistory()
			},
			
			// 建议搜索列表
			gotoDetail(item){
				uni.navigateTo({
					// 指定详情页面的url地址，并传递goods——id参数
					url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
				})
			},
			// 保存搜索关键字的方法
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				this.historyList = Array.from(set);
				// 调用该方法将搜索历史记录持久化存储到本地
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			// 清除搜索记录
			clean(){
				this.historyList=[]
				uni.setStorageSync('kw','[]')
			},
			// 点击跳转到商品列表页面
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query='+item
				})
			}
		},
		// 计算属性
			computed:{
				histories(){
					return [...this.historyList].reverse()
				}
			}
	}
</script>

<style lang="scss">
.search-box{
	position: sticky;
	top: 0;
	z-index: 999;
	background-color: #C00000;
}
// 美化搜索建议列表
.sugg-list{
	padding: 0 5px;
	.sugg-item{
		font-size: 12px;
		padding: 13px 0;
		border-bottom: 1px solid #efefef;
		display: flex;
		align-items: center;
		justify-content: space-between;
	}
	.goods-name{
		white-space: nowrap;
		overflow: hidden;
		text-overflow: ellipsis;
		margin-right: 3px;
	}
}
// 搜索历史
.history-box{
	padding: 0 5px;
	.history-title{
		display: flex;
		justify-content: space-between;
		height: 40px;
		align-items: center;
		font-size: 13px;
		border-bottom: 1px solid #efefef;
	}
	.history-list{
		display: flex;
		flex-wrap: wrap;
		.uni-tag{
			display: inline-block;
			margin-top: 5px;
			margin-right: 5px;
		}
	}
}
</style>
